noun🔗Share主ゼンマイThe principal spring of a clockwork mechanism, which drives it by uncoiling."The old clock stopped working because the mainspring was broken. "古い時計は主ゼンマイが壊れたため、動かなくなりました。machineparttechnicaldevicetimeChat with AIVocabulary GamePractice Reading
noun🔗Share原動力、主因The most important reason for something (Cf. spring "origin of something" (literary) (often in the plural) the springs of her ambition)."My daughter is the mainspring of my life."私の娘は私の人生の原動力です。businessattitudemindphilosophyChat with AIVocabulary GamePractice Reading
